A Prete surfboard! Fun stuff like this is the sort of thing I love in fingerboarding, people stepping outside the boundaries of skateboarding and making some other finger sized stuff. I have no idea if these work, but I believe tech deck made a finger surfboard ages ago or something, and that worked, so this probably should too!
Go check Prete's site and wait impatiently for a stock of the 6009 series here :)